Memory Bank Auto-Precharge for Maximum Row Active Time
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Solution Overview
Problem
Current memory technologies face issues such as data loss, memory degradation, and potential damage due to extended activation times of memory banks without timely precharge commands, which can be exacerbated by malicious attacks.
Innovation Solution
Implementing internal precharge commands in memory devices to enforce a maximum row active time (tRASmax) based on device characteristics, with feedback mechanisms to address tRASmax violations and mitigate unintended prolonged activations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the memory bank is activated for extended period of time to maintain data accessibility, then data retrieval capability is improved, but data loss occurs due to insufficient refresh and memory device life is reduced
Solution Approach 1:
The memory device includes a feedback mechanism that monitors the active time of memory banks and automatically issues precharge commands when maximum row active time is exceeded. This closed-loop control ensures that memory banks are closed timely to prevent data loss and degradation, resolving the contradiction between maintaining data accessibility and ensuring data retention.
Solution Approach 2:
The memory device performs self-monitoring and self-correction by automatically detecting when a memory bank has been active too long and autonomously issuing the precharge command without external intervention. This self-service capability prevents data loss and extends memory device life while maintaining operational efficiency.
2Duration of action of stationary object
If the memory bank is kept open for extended period of time to allow continuous operations, then operational continuity is improved, but memory degradation and potential damage occurs
Solution Approach 1:
The system performs preliminary action by setting a maximum row active time threshold before damage occurs. The monitoring circuit continuously checks against this predetermined limit and issues precharge commands proactively when the threshold is approached or exceeded, preventing memory degradation before it happens rather than reacting after damage occurs.
Solution Approach 2:
A continuous feedback loop monitors the active duration of each memory bank and compares it against the maximum allowed time. When the monitored time reaches the threshold, the system automatically triggers a precharge command to close the memory bank, thereby preventing degradation while maintaining operational continuity through automated control.
3Device complexity
If no internal enforcement mechanism is implemented to allow host device full control, then system simplicity is improved, but malicious attacks can intentionally damage memory banks by keeping them open
Solution Approach 1:
An intermediary monitoring circuit is introduced between the host device controller and the memory bank activation logic. This intermediary component silently observes activation commands and timing, and automatically intervenes by issuing precharge commands when maximum row active time is exceeded, thereby blocking malicious attacks without disrupting normal host device operations or requiring complex security protocols.
Solution Approach 2:
The memory device incorporates self-protective functionality by autonomously monitoring its own operational state and automatically taking corrective action (issuing precharge commands) when abnormal conditions are detected. This self-service security mechanism protects against malicious attacks without requiring external security systems or complicating the control architecture.
Data Source
AI summary
A system for providing maximum row active time enforcement for memory devices is disclosed. A host device issues an activate command to activate a memory bank of a plurality of memory banks of a memory. The memory device activates the memory bank and determines whether a precharge command to close the first memory bank has been issued by the host device within a maximum threshold amount of time since issuance of the activate command. If the system determines that the precharge command has been issued by the host device within the threshold, the memory device closes the memory bank via the host-issued precharge command. If, however, the system determines that the precharge command has not been issued by the host device within the threshold, the memory device internally issues a precharge command to close the memory bank to reduce potential data loss and other harmful effects to the memory device.